<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input type="number"> <button>发送</button>
    <script>
    
var btn =document.querySelector('button');
btn.addEventListener('click',function(){
btn.disabled=true;
var time=60;
        time=setInterval(function(){
            if(time==0){
                clearInterval(time);
                btn.disabled=false;
                btn.innerHTML='发送';
                time=60;

            }else{
                btn.innerHTML="还剩下"+time+"秒";
                time--;
            }
        },1000);

    })
    </script>
</body>
</html>